10. No one knows who killed her, but the police s___________ her husband.

9. My uncle has been working as an engineer in that power p_________ for over 20 years.

8. A five-day week system i__________ from abroad has been carried out for years in China.

7. Before going out shopping, my mother always l_________ the things she wanted to buy.

6. The doctor gave him a t__________ check-up and found there was nothing wrong with him.

5. At present, the most widely used __________ (媒体) of communication --- for business and 　personal matters ---is e-mail.

4. Our business has come to a _______________ (关键时刻): if this deal succeeds, our future is

　 assured; if not, we shall be bankrupt.

3. When reading, Jack often _______________ (加下划线) the important parts so as to draw his　 attention to them.

2. I suggest you taking an umbrella when you go out because the weather here is 　quite _____________ (易变的).